1 John 3:10-12

Darby Translation

¹⁰ In this are manifest the children of God and the children of the devil. Whoever does not practise righteousness is not of God, and he who does not love his brother.

¹¹ For this is the message which ye have heard from the beginning, that we should love one another:

¹² not as Cain was of the wicked one, and slew his brother; and on account of what slew he him? because his works were wicked, and those of his brother righteous.